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A core-shell catalyst for selective hydrodeoxygenation of guaiacol to cyclohexanol

A core-shell structure, guaiacol technology, applied in the direction of physical/chemical process catalysts, hydrogenation preparation, chemical instruments and methods, etc., can solve the problem of short service life of catalysts, low selectivity of reaction products, and easy oxidation of oxygen-containing compounds. Polymerization and other problems, to achieve the effect of good anti-sintering performance, good selectivity of the target product, and high reactivity

Active Publication Date: 2017-04-12
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the harsh reaction conditions in the hydrodeoxygenation process, which requires high temperature and high pressure, the oxygen-containing compounds are easy to polymerize and coke, covering the surface of the catalyst, so that the service life of the catalyst is not long
Moreover, the selectivity of the reaction product is not high, which is also a major defect of the catalyst.

Method used

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  • A core-shell catalyst for selective hydrodeoxygenation of guaiacol to cyclohexanol
  • A core-shell catalyst for selective hydrodeoxygenation of guaiacol to cyclohexanol
  • A core-shell catalyst for selective hydrodeoxygenation of guaiacol to cyclohexanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Weigh 7g Ni(NO 3 ) 2 x6 2 O, dissolve it in 700ml of ethanol aqueous solution (volume ratio of alcohol to water: 4:3), add 1g of polyvinylpyrrolidone (PVP) as a stabilizer, and stir well. Then, under stirring condition, 140ml of 25% ammonia water was added dropwise and left for 10min.

[0027] Step 2: Weigh 6g of surfactant cetyltrimethylammonium bromide (CTAB), add it into the above solution, stir evenly, and let stand for 10min. Then measure 20ml of tetraethyl orthosilicate (TEOS), and add it dropwise into the solution under stirring condition. Place it at room temperature for 48 hours.

[0028] Step 3: Filter out the precipitate, wash it with deionized water, dry it in an oven at 60°C for 12 hours, grind it after the end, calcinate it in a muffle furnace at 500°C for 6 hours, and finally reduce it in a hydrogen atmosphere at 550°C for 6 hours to obtain 20 %Ni@SiO 2 Core-shell catalysts.

[0029] 20%Ni@SiO 2 SEM and TEM images of core-shell catalysts c...

Embodiment 2

[0036] Step 1: Weigh 10.5g Ni(NO 3 ) 2 x6 2 O, dissolve it in 1000ml of ethanol aqueous solution (volume ratio of alcohol to water: 1:1), add 2g of polyvinylpyrrolidone (PVP) as a stabilizer, and stir well. Then, under stirring condition, 210ml of 25% ammonia water was added dropwise and left for 10min.

[0037] Step 2: Weigh 9g of surfactant cetyltrimethylammonium bromide (CTAB), add it to the above solution, stir evenly, and let stand for 10min. Then measure 30ml of tetraethyl orthosilicate (TEOS), and add it dropwise into the solution under stirring condition. Place it at room temperature for 48 hours.

[0038] Step 3: Filter out the precipitate, wash it with deionized water, dry it in an oven at 60°C for 12 hours, grind it after the end, calcinate it in a muffle furnace at 500°C for 4 hours, and finally reduce it in a hydrogen atmosphere at 550°C for 4 hours to obtain 20 %Ni@SiO 2 Core-shell catalysts.

[0039]Evaluation of catalytic performance: Add 20ml of decahyd...

Embodiment 3

[0043] Step 1: Weigh 4.6g Ni(CH 3 COO) 2 4H 2 O, dissolve it in 700ml of ethanol aqueous solution (volume ratio of alcohol to water: 4:3), add 1g of polyvinylpyrrolidone (PVP) as a stabilizer, and stir well. Then, under stirring condition, 100 ml of 25% ammonia water was added dropwise and left for 10 min.

[0044] Step 2: Weigh 6 g of cetyltrimethylammonium bromide (CTAB) as a surfactant, add it to the above solution, stir evenly, and let stand for 10 minutes. Then measure 20ml of tetraethyl orthosilicate (TEOS), and add it dropwise into the solution under stirring condition. Place it at room temperature for 48 hours.

[0045] Step 3: Filter out the precipitate, wash it with deionized water, dry it in an oven at 60°C for 12 hours, grind it after the end, calcinate it in a muffle furnace at 500°C for 6 hours, and finally reduce it in a hydrogen atmosphere at 550°C for 6 hours to obtain 15 %Ni@SiO 2 Core-shell catalysts.

[0046] Evaluation of catalytic performance: Add ...

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Abstract

The invention discloses a core-shell structure catalyst that catalyzes the selective hydrodeoxygenation of guaiacol to prepare cyclohexanol. The preparation method of the SiO2-wrapped Ni@SiO2 core-shell structure catalyst prepared by the present invention includes the following steps: in an alcohol-water mixed solvent, add soluble nickel salt and polyvinylpyrrolidone and stir evenly, then add ammonia water dropwise while stirring, and then Add cetyltrimethylammonium bromide as a surfactant, and finally add the soluble silicon source dropwise and stir vigorously. After filtration, collection, water washing, drying, calcination and reduction, the Ni@SiO2 core-shell structure catalyst can be obtained. The Ni@SiO2 core-shell structure catalyst prepared by the process method of the present invention has the characteristics of high target product selectivity, good sintering resistance and strong carbon deposition resistance in the guaiacol hydrodeoxygenation reaction.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a core-shell structure catalyst for catalyzing the selective hydrodeoxygenation of guaiacol to prepare cyclohexanol. Background technique [0002] With the depletion of fossil fuels, energy demand is getting tighter. Biomass has the characteristics of rich carbon content, large reserves, wide distribution, low pollution, cheap and renewable. Compared with fossil fuels, its sulfur and nitrogen content are lower, and its ash content is also very small. It is a potential petrochemical alternative energy source. As the main component of biomass, lignin is the main by-product of the paper industry, most of which are directly burned as fuel, which not only brings great pressure to the environment, but also causes serious waste of resources. Lignin is a natural polymer composed of phenylpropane structural units. Through liquefaction through directional catalytic depolyme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J35/02C07C35/08C07C29/20B01J35/00
Inventor 张琦舒日洋龙金星张兴华马隆龙王铁军
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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